Intramembrane binding of VE-cadherin to VEGFR2 and VEGFR3 assembles the endothelial mechanosensory complex.

Intramembrane binding of VE-cadherin to VEGFR2 and VEGFR3 assembles the endothelial mechanosensory complex.
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DOI:
10.1083/jcb.201408103
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发表时间:
2015-03-30
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Schwartz MA
Schwartz MA
中科院分区:
其他
文献类型:
--
作者:
Coon BG;Baeyens N;Han J;Budatha M;Ross TD;Fang JS;Yun S;Thomas JL;Schwartz MA

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VE-钙粘蛋白通过其跨膜域与 VEGFR 相互作用,在内皮剪切应力机械转导中发挥关键作用。内皮对流体剪切应力的反应对于血管发育和生理学至关重要,并决定血流紊乱区域动脉粥样硬化斑块的形成。之前的研究表明,VE-钙粘蛋白与 PECAM-1 和 VEGFR2 一起是介导血流信号转导的复合物的重要组成部分。然而,人们对 VE-钙粘蛋白的确切作用知之甚少。我们现在表明,VE-钙粘蛋白的跨膜结构域通过直接与 VEGFR2 以及 VEGFR3 的跨膜结构域结合来介导重要的接头功能,我们现在将其确定为连接机械感觉复合物的另一个组成部分。 VEGFR2 和 VEGFR3 在 VE-钙粘蛋白下游冗余地发出信号。此外,在主动脉内皮细胞中观察到 VEGFR3 表达,它有助于体内血流反应。总之,本研究确定了 VE-钙粘蛋白的一种新的接头功能,该功能由跨膜结构域与 VEGFR 的关联介导。
VE-cadherin plays a critical role in endothelial shear stress mechanotransduction by interacting with VEGFRs through their transmembrane domains. Endothelial responses to fluid shear stress are essential for vascular development and physiology, and determine the formation of atherosclerotic plaques at regions of disturbed flow. Previous work identified VE-cadherin as an essential component, along with PECAM-1 and VEGFR2, of a complex that mediates flow signaling. However, VE-cadherin’s precise role is poorly understood. We now show that the transmembrane domain of VE-cadherin mediates an essential adapter function by binding directly to the transmembrane domain of VEGFR2, as well as VEGFR3, which we now identify as another component of the junctional mechanosensory complex. VEGFR2 and VEGFR3 signal redundantly downstream of VE-cadherin. Furthermore, VEGFR3 expression is observed in the aortic endothelium, where it contributes to flow responses in vivo. In summary, this study identifies a novel adapter function for VE-cadherin mediated by transmembrane domain association with VEGFRs.
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